Well killing treatment method for well kick in process of pulling out of hole

Abstract

The invention discloses a well killing treatment method for well kick in the process of pulling out of a hole. A well is shut in, and a mass flow meter is connected in a throttle manifold; the stratum pressure is calculated by means of the hydraulic parameter and other parameters in the drilling process; by controlling the opening degree of a throttle valve and combining the reading value of the mass flow meter, first time of operation of drilling with pressure is conducted; whether a drill bit meets a gas cut drilling fluid or not is judged; the well killing drilling depth and the density of a well killing fluid are determined; well killing is conducted through an engineer method, and the gas cut drilling fluid in the well is circulated out of the well in a circular week; and well killing drilling depth calculating, density determining and well killing through the engineer method are conducted circularly, till the gas cut drilling fluid is overall circulated out of the well. Well kick in the drilling process can be subjected to well killing design, by means of theoretical calculation and process operation, the time that the drill bit reaches the top of the gas cut drilling fluid is judged, accordingly the start time of well killing is determined, and guarantee is provided for safely and effectively circulating out the gas cut drilling fluid in the well.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling well control, and in particular relates to a method for killing a well kick during drilling and tripping. Background technique [0002] In the traditional drilling and operation process, gas invasion, well kick and even blowout accidents occurred in the process of tripping drill pipe and tubing account for a large proportion. One of the main reasons for this situation is that when the drilling is pulled out, the mud pump stops and the equivalent circulating density converted from the circulating pressure loss disappears; on the other hand, when the drilling tool moves upwards in the wellbore, the drilling fluid in the well The pumping effect produced by the flow will lead to a decrease in the bottom hole pressure; in addition, the drilling speed is too fast and the drilling fluid cannot be replenished into the well in time during the drilling process, which directly leads to a decrease ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the well kick is caused when the drilling is pulled out, and the drill bit is not at the bottom of the well, the conventional well killing method cannot be used. The calculation of the key parameters of the regularity and kick rate can circulate the gas-invasion fluid in the wellbore out of the wellbore by gradually drilling down to the bottom of the wellbore, thus providing a guarantee for successful well killing

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